DONNOKGetting lent money back a year late: how much purchasing power is lost?
Lend 10 million won in August 2025, get the same amount back in August 2026, and it buys about 9.70 million won’s worth at South Korean prices. One-, two- and three-year results, plus how to track it in DONNOK.
How do you calculate the purchasing power of money repaid late?
The formula is amount repaid × price index in the month you lent ÷ price index in the month you were repaid. It compares what 10 million won could buy when you lent it with what the same 10 million won buys when it comes back.
With 116.45 for August 2025 and 120.05 for August 2026, that is 10,000,000 × 116.45 ÷ 120.05 ≈ 9,700,125 won. These are teaching examples using monthly index values; the app estimates values between months, so its display can differ slightly.
What difference do one, two or three years make?
The longer the delay, the bigger the gap. From August 2023 to August 2026 the index rose about 6.92%, so the same 10 million won lost about 650,000 won’s worth of purchasing power.
| Month lent (index) | Purchasing power in August 2026 | Purchasing power lost | Amount needed for the same purchasing power |
|---|---|---|---|
| August 2025 (116.45) | About 9,700,125 won | About 299,875 won | About 10,309,146 won |
| August 2024 (114.54) | About 9,541,025 won | About 458,975 won | About 10,481,055 won |
| August 2023 (112.28) | About 9,352,770 won | About 647,230 won | About 10,692,020 won |
What can I see by adding it as Receivables in DONNOK?
The Receivables category is for money owed to you. Record the amount and watch how its estimated purchasing power changes from the day you lent it. It assumes full repayment and does not calculate repayment risk or any agreed interest.
- Open the My funds tab and tap Add fund.
- Choose Receivables and enter a name (for example, Loan to a friend) and the amount.
- Under Registration date · Observation starts, pick the day you lent the money. Earlier dates are allowed.
- Tap Save and observe. The amount is included in the total on My display. In My funds, browse by the Receivables category to see each fund’s estimated purchasing power.
- Once you are repaid, delete the fund or record the money again under another category.
What should I keep in mind when using this calculation?
A consumer price index reflects average household spending, so your personal experience of prices may differ. This calculation only shows the purchasing power of getting the same amount back; it does not decide what interest or late-payment charges you are owed.
Interest agreements, late-payment charges and the time limits for claiming money depend on your contract and the law where you live. For an actual claim or dispute, talk to a legal professional. DONNOK does not manage or collect debts; it shows how the money’s purchasing power changes.